> Awesome thanks! My rent increased but the notice only went out with 60 days notice, should have been 75 days of I read it correctly!

This is technically correct -- per the DC code, if you're required to give 60 days notice before vacating the property, they're required to give you 75 days notice before a rent increase.

However, if your lease ended 12/1 and they gave you the notice on 9/2, they actually gave you 90 days notice. So the rent increase is allowed by those rules.

Secondly, if you gave them notice on 10/8, you're on the hook til 12/8. Thus, the extra 8 days they're requiring you to pay. That would be true even if the rent increase was incorrect some how.

Finally, they are required to try to mitigate damages in a reasonable way. That is, they do have some responsibility for attempting to lease the apartment once you've given notice that you're leaving; they can't just have the apartment be empty for months after you've gone and charge you without attempting to let it. However, I don't think that really applies to your case, right? It's a relatively short notice and you're only on the hook for 8 days.